P0088
HighP0088 — Fuel Rail Pressure Too High
Description
What P0088 Means
Code P0088 indicates that fuel pressure in the rail is above the allowable level. A faulty fuel pressure regulator or fuel pump can cause this, leading to engine running problems.
The BMW injection system monitors rail pressure with a pressure sensor and regulates it through a control valve. When pressure runs too high, the DME logs the fault to prevent component damage and keep the mixture correct.
Symptoms
Symptoms
- Engine misfires
- Poor fuel economy
- Check Engine light comes on
Causes and fixes
Diagnosis and Repair
- Check the fuel pressure regulator.
- Inspect the fuel pump.
- Replace the faulty components.
Possible secondary damage
Secondary Damage
A repeat failure after pump replacement: leftover metal debris can be drawn into the new pump. A high-pressure pump that has already come apart may have sent metal into the rail and injectors, and left it in the tank and lines.